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REMOVAL - TM-5-4210-220-34_32
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TM-5-4210-220-34 Truck Firefiighting 1000 GPM Multipurpose Model 2500L Manual
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REPAIR - TM-5-4210-220-34_35
TM 5-4210-220-34 2-9. SIREN AND PA SYSTEM. This task covers: a. Removal b.    Installation c.    Repair INITIAL SETUP: TOOLS EQUIPMENT CONDITION Shop Equipment, Automotive Main Engine Shutdown (see TM 5-4210-220-12) Maintenance and Repair, APU Engine Shutdown (see TM 5-4210-220-12) NSN 4910-00-754-0650 Batteries Disconnected (see TM 5-4210-220-12) REMOVAL Remove screws (1) and pull siren module (2) out of chassis. INSTALLATION (1)     Check  that  plugs  on  the  back  side  of  siren module   and   corresponding   receptacles   in chassis    are    securely    installed.        Secure attachment  is  necessary  to  ensure  proper electrical contact when module is installed. (2)     Slide    module    (2)    into    place    In    chassis. Install and tighten screws (1). REPAIR Siren Module Repair NOTE Repair of the siren unit or module Is only done by electronic maintenance personnel at the intermediate level.    The  following  repair  procedure  is  limited  to  cover  the  siren  module  only  as  no  functions  are identified for the option control module . (1)     Only a limited number of components are replaceable in the siren module since components on the printed circuit boards are not considered individually replaceable.  Use the illustrations and legends to identify  the  replaceable  parts.    For  convenience,  the  parts  are  Identified  by  their  circuit  reference numbers. Be  careful  when  replacing  and  soldering  small  components.    Heat  easily  damages  integrated  circuits, transistors,  capacitors  and  circuit  boards.    Therefore,  it  is  advisable  to  use  long  nose  pliers  or  similar devices as a heat sink on component leads being soldered. (2)     When replacing the output amplifier transistors, Q301 and 0302,  always  ensure  that  they  are  replaced  in  a matched pair.  Make sure that the wire insulators used with the transistors are replaced also.  When installing new transistors use a heat sink compound on both sides of the mica insulators.  Be sure the insulators are installed correctly, otherwise a short circuit may occur. 2-26

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